cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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sve-probe-vls.c (1467B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (C) 2015-2020 ARM Limited.
      4 * Original author: Dave Martin <Dave.Martin@arm.com>
      5 */
      6#include <assert.h>
      7#include <errno.h>
      8#include <stdio.h>
      9#include <stdlib.h>
     10#include <string.h>
     11#include <sys/auxv.h>
     12#include <sys/prctl.h>
     13#include <asm/sigcontext.h>
     14
     15#include "../../kselftest.h"
     16#include "rdvl.h"
     17
     18int main(int argc, char **argv)
     19{
     20	unsigned int vq;
     21	int vl;
     22	static unsigned int vqs[SVE_VQ_MAX];
     23	unsigned int nvqs = 0;
     24
     25	ksft_print_header();
     26	ksft_set_plan(2);
     27
     28	if (!(getauxval(AT_HWCAP) & HWCAP_SVE))
     29		ksft_exit_skip("SVE not available\n");
     30
     31	/*
     32	 * Enumerate up to SVE_VQ_MAX vector lengths
     33	 */
     34	for (vq = SVE_VQ_MAX; vq > 0; --vq) {
     35		vl = prctl(PR_SVE_SET_VL, vq * 16);
     36		if (vl == -1)
     37			ksft_exit_fail_msg("PR_SVE_SET_VL failed: %s (%d)\n",
     38					   strerror(errno), errno);
     39
     40		vl &= PR_SVE_VL_LEN_MASK;
     41
     42		if (rdvl_sve() != vl)
     43			ksft_exit_fail_msg("PR_SVE_SET_VL reports %d, RDVL %d\n",
     44					   vl, rdvl_sve());
     45
     46		if (!sve_vl_valid(vl))
     47			ksft_exit_fail_msg("VL %d invalid\n", vl);
     48		vq = sve_vq_from_vl(vl);
     49
     50		if (!(nvqs < SVE_VQ_MAX))
     51			ksft_exit_fail_msg("Too many VLs %u >= SVE_VQ_MAX\n",
     52					   nvqs);
     53		vqs[nvqs++] = vq;
     54	}
     55	ksft_test_result_pass("Enumerated %d vector lengths\n", nvqs);
     56	ksft_test_result_pass("All vector lengths valid\n");
     57
     58	/* Print out the vector lengths in ascending order: */
     59	while (nvqs--)
     60		ksft_print_msg("%u\n", 16 * vqs[nvqs]);
     61
     62	ksft_exit_pass();
     63}